The exceptionally tasteful BIML logo was designed by Jackie McGraw. The logo incorporates both a yin/yang concept (huh, wonder where that comes from?) and a glyph that incorporates a B, and M, and an L in a clever way.
Here is the glyph:
Here is my personal logo (seen all over, but most famously on the cover of Software Security:
Here is the combined glyph plus yin/yang which makes up the official BIML logo.
Last, but not least, there is the “bonus” cow, which secretly includes a picture of Clarke county in its spots. Clarke county is where metropolitan Berryville is situated in Virginia.